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E144-Pin package exposed ground pad issue

RLee42
Novice
697 Views

I use MAX10 10M08SAE144 for my design. When I design the footprint for this chip, I read this from pin information document: " The E144-pin package has an exposed ground pad at the bottom of the package. The exposed ground pad is used for electrical connectivity and not for thermal purposes. You must connect the exposed ground pad to the ground plane of the PCB". In order to save routing path, can I drill some vias on this pad which connect to the ground plane, instead of connect this pad to other ground pins through wires?

E144.PNG

 

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ak6dn
Valued Contributor III
273 Views

Absolutely you want to connect the ground pad directly to the ground plane. Don't use long traces to wire it to the other ground pins. They should connect direct to the ground plane as well with a local via per pin. Ditto for VCC pins that connect to a VCC plane (if present).

 

As to whether you can have VIAs directly within the EPAD it depends on the capability of your PCB vendor and assembly house. Some allow VIA-in-PAD, others may not want you to do that, and instead have the VIAs just outside the EPAD connected by short traces.

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ak6dn
Valued Contributor III
274 Views

Absolutely you want to connect the ground pad directly to the ground plane. Don't use long traces to wire it to the other ground pins. They should connect direct to the ground plane as well with a local via per pin. Ditto for VCC pins that connect to a VCC plane (if present).

 

As to whether you can have VIAs directly within the EPAD it depends on the capability of your PCB vendor and assembly house. Some allow VIA-in-PAD, others may not want you to do that, and instead have the VIAs just outside the EPAD connected by short traces.

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